将 LINQ 结果转换为 ObservableCollection [英] Cast LINQ result to ObservableCollection

问题描述

事实上，它是一个 LINQ 结果可能与问题无关，但无论如何我都会提到它 - 因为这是导致这个问题的上下文.

The fact that it is a LINQ result might perhaps not be relevant for the question, but I'm mentioning it anyway - since this is the context which has resulted in this question.

我运行了一个 LINQ 查询.结果是;

I run a LINQ query. The result is an;

IEnumerable<MyClass> 

我想把结果放到一个 ObservableCollection 中；

I want to put the result into an ObservableCollection;

ObservableCollection<MyClass> 

我该怎么做这个演员表?(无需运行 IEnumerable 并将元素复制到 ObservableCollection).我注意到 LINQ 有一些 To..() 函数，但它似乎对这个演员没有帮助..?

How do I do this cast? (without running through the IEnumerable and copying elements to the ObservableCollection). I notice LINQ has got a few To..() functions, but it doesn't seem to help me for this cast..?

推荐答案

只需使用:

ObservableCollection<Foo> x = new ObservableCollection<Foo>(enumerable);

这将完成所需的复制.无法观察实时查询的变化 - 尽管 ObservableQuery 的想法很有趣(尽管具有挑战性).

That will do the required copying. There's no way of observing changes to the live query - although the idea of an ObservableQuery<T> is an interesting (though challenging) one.

如果你想要一个扩展方法来做到这一点，很简单:

If you want an extension method to do this, it's simple:

public static ObservableCollection<T> ToObservableCollection<T>
    (this IEnumerable<T> source)
{
    if (source == null)
    {
        throw new ArgumentNullException("source");
    }
    return new ObservableCollection<T>(source);
}

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